package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.LoginUserVO;
import com.yupi.yupicturebackend.model.vo.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import com.yupi.yupicturebackend.model.entity.User ;
import com.yupi.yupicturebackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;

import java.util.ArrayList;
import java.util.List;

import static com.yupi.yupicturebackend.constant.UserConstant.USER_LOGIN_STATE;

/**
* @author Lenovo
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-04-09 11:45:31
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService {

    //封装用户密码加密方法
    public String getEncryptPassword(String userPassword){
        //盐值,混淆密码
        final String SALT="yupi";
        return DigestUtils.md5DigestAsHex((SALT+userPassword).getBytes());
    }

    /**
     * 判断是否为管理员
     * @param user
     * @return
     */
    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }

    /**
     * 获取脱敏类的用户信息
     *
     * @param user 用户
     * @return 脱敏后的用户信息
     */

    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtil.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    /**
     * 用户注销
     * @param request
     * @return
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
        //先判断是否已经登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        if(userObj == null){
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"未登录");
        }
        //移除登录状态
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    /**
     * 获取单个用户信息
     * @param user
     * @return
     */
    @Override
    public UserVO getUserVO(User user) {
        if(user == null){
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user,userVO);
        return userVO;
    }


    /**
     * 获取用户列表
     * @param userList
     * @return
     */
    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if(CollUtil.isEmpty(userList)){
            return new ArrayList<>();
        }
       List<UserVO> resultList = new ArrayList<>(); // 创建一个新的 List 存放结果
        for (User user : userList) {                 // 遍历 userList
            UserVO userVO = getUserVO(user);         // 调用 getUserVO 方法转换
            resultList.add(userVO);                  // 将转换后的结果添加到新 List
        }
        return resultList;                           // 返回转换后的 List
        //return userList.stream().map(this::getUserVO).collect(Collectors.toList());

    }

    /**
     * 用户注册
     * @param userAccount
     * @param userPassword
     * @param checkPassword
     * @return
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {

        //1.数据校验
        if(StrUtil.hasBlank(userAccount,userPassword,checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if(userAccount.length()<4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号过短");
        }
        if(userPassword.length()<8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户密码过短");
        }
        if(!userPassword.equals(checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"两次输入的密码不一致");
        }

        //2.检查用户是否重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount",userAccount);
        long count = this.baseMapper.selectCount(queryWrapper);
        if(count > 0){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号重复");
        }
        //3.加密存储
        String encryptPassword = getEncryptPassword(userPassword);
        //4.存储数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("无名");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user);
        if(!saveResult){
            throw new BusinessException(ErrorCode.SYSTEM_ERROR,"注册失败,数据库错误");
        }
        return user.getId();
    }



    /**
     * 用户登录
     * @param userAccount
     * @param userPassword
     * @return
     */
    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1.数据校验
        if(StrUtil.hasBlank(userAccount,userPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if(userAccount.length()<4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号错误");
        }
        if(userPassword.length()<8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"密码错误");
        }
        //2.密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        //查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount",userAccount);
        queryWrapper.eq("userPassword",encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        if( user == null){
            log.info("user login failed,userAccount not match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户不存在或密码错误");
        }

        //3.记录用户登录态
        request.getSession().setAttribute(USER_LOGIN_STATE,user);
        return this.getLoginUserVO(user);
    }

    /**
     * 获取当前登录用户
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        //先从session中获取登录用户ID,判断是否已登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if(currentUser == null || currentUser.getId() == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        //已经登录,从数据库查询
        Long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if(currentUser == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    /**
     * 将用户查询请求转化为QueryWrapper对象
     * @param userQueryRequest
     * @return
     */
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest){
        if(userQueryRequest == null){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        String createDateStart = userQueryRequest.getCreateDateStart();
        String createDateEnd = userQueryRequest.getCreateDateEnd();

        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id),"id",id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole),"userRole",userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount),"userAccount",userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName),"userName",userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile),"userProfile",userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField),sortOrder.equals("ascend"),sortField);
        queryWrapper.ge(StrUtil.isNotBlank(createDateStart),"createTime",createDateStart);
        queryWrapper.le(StrUtil.isNotBlank(createDateEnd),"createTime",createDateEnd);
        return queryWrapper;
    }

}




